ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Supersaturated solid solutions of Cu-44.5at.%Ni-22.5at.%Fe and Cu-37at.%Ni-6at.%Cr alloy wereproduced by ball milling of a pure chemical elemental mixture for 1080 ks. Two fcc supersaturatedsolid solutions with a grain size of about 20 and 50 nm, respectively, were obtained after milling.These alloys were subsequently aged at temperatures between 800 and 1003 K for different times.The aging promoted the phase decomposition of the supersaturated solid solution into a mixture ofCu-rich and Ni- phases in both the aged MA alloy powders. The growth kinetics of the modulationwavelength was determined from the X-ray diffraction results and followed the Lifshitz-Slyozov-Wagner theory for a diffusion-controlled coarsening in the mechanically-alloyed Cu-Ni-Fe alloyafter aging. However, the sidebands intensity seems to be very low and overlapped with the peakscorresponding to the Cu-rich phase in the aged mechanically-alloyed Cu-Ni-Cr alloy. The growthkinetics of composition modulation wavelength for the aged MA Cu-Ni-Fe alloy was faster at 803and 898 K than that for the same alloy composition obtained by a conventional processing and thenaged at the same temperatures
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.678.pdf
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